Remove logic to reset input method more than needed

third_party/WebKit/Source/core/editing/InputMethodController.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 465 matching lines @@
     return;
 
   // An open typing command that disagrees about current selection would cause
   // issues with typing later on.
   TypingCommand::closeTyping(m_frame);
 
   // No DOM update after 'compositionend'.
   dispatchCompositionEndEvent(frame(), emptyString);
 }
 
-void InputMethodController::cancelCompositionIfSelectionIsInvalid() {
-  if (!hasComposition() || editor().preventRevealSelection())
-    return;
-
-  // Check if selection start and selection end are valid.
-  FrameSelection& selection = frame().selection();
-  if (!selection.isNone() && !m_compositionRange->collapsed()) {
-    if (selection.start().compareTo(m_compositionRange->startPosition()) >= 0 &&
-        selection.end().compareTo(m_compositionRange->endPosition()) <= 0)
-      return;
-  }
-
-  cancelComposition();
-  frame().chromeClient().didCancelCompositionOnSelectionChange();
-}
-
 // If current position is at grapheme boundary, return 0; otherwise, return the
 // distance to its nearest left grapheme boundary.
 static size_t computeDistanceToLeftGraphemeBoundary(const Position& position) {
   const Position& adjustedPosition = previousPositionOf(
       nextPositionOf(position, PositionMoveType::GraphemeCluster),
       PositionMoveType::GraphemeCluster);
   DCHECK_EQ(position.anchorNode(), adjustedPosition.anchorNode());
   DCHECK_GE(position.computeOffsetInContainerNode(),
             adjustedPosition.computeOffsetInContainerNode());
   return static_cast<size_t>(position.computeOffsetInContainerNode() -
@@ skipping 612 matching lines @@
   frame().chromeClient().resetInputMethod();
 }
 
 DEFINE_TRACE(InputMethodController) {
   visitor->trace(m_frame);
   visitor->trace(m_compositionRange);
   SynchronousMutationObserver::trace(visitor);
 }
 
 }  // namespace blink